Rear-suspension conversions parallel the front-suspension work in scope but address a different set of issues. The principal modifications available are telescopic damper conversions (replacing the original Armstrong rear lever-arm dampers), parabolic-spring conversions (replacing the original multi-leaf springs with single-leaf parabolic units), and the supporting geometry adjustments that go alongside either change. Each transforms the rear-end behaviour of the car in distinct ways.
The Five-Link Coil-Spring Conversion, Ultimate Rear Setup
The headline MGOC rear-suspension conversion is a bolt-on five-link coil-spring telescopic-damper rear suspension set-up for MGB, GT and V8 models, the ultimate rear suspension upgrade available for the cars, transforming the rear axle's location and damping behaviour to a fully-modern standard. The five-link arrangement locates the axle on five separately engineered links rather than the original leaf-spring arrangement, removing the axle-tramp and spring-wind-up issues that the original specification can develop on tuned engines or under hard cornering. The coil-spring and telescopic-damper combination delivers the modern feel of an independent rear suspension while retaining the live-axle robustness that suits the classic-MG application.
Telescopic Damper Conversions
The original Armstrong lever-arm rear dampers connect the axle to the body through the same drop-link arrangement as the front dampers, with the damper resistance acting through the lever arm. Telescopic-damper conversions replace the lever arm with a bracketed mounting that takes a modern telescopic damper, with the damper acting directly between the axle and the body in the manner of any modern car. The benefits are similar to the front-conversion case, wider tuning range, easier service, and the option of adjustable damping settings. Rear telescopic conversions also typically improve damping consistency under hard cornering, where the lever-arm damper can struggle to maintain its characteristic under sustained high-amplitude inputs.
Parabolic Spring Conversions
Parabolic springs replace the original multi-leaf rear springs with single-leaf units of carefully-tapered cross-section. The parabolic profile means the spring has the right stiffness at every point along its length, producing a more progressive load response than a multi-leaf spring can achieve. The driving characteristic is noticeably improved, better small-amplitude compliance, smoother response over moderate bumps, and a more controlled behaviour at the limit of grip. The trade-off is that parabolic springs almost always require telescopic damper conversion at the same time, the original lever-arm dampers cannot maintain control over the parabolic spring's reduced internal friction, and the result without the matched damper is a rear end that feels under-damped and wallowy.
Parabolic spring kits are typically supplied alongside the telescopic damper conversion as a matched package.
Supporting Modifications
Rear-suspension conversion work commonly involves several supporting adjustments. The brake-line and handbrake-cable positions may need adjustment if the new damper or spring geometry has changed the axle's range of travel. Anti-roll-bar mounting points may need to be reviewed where the new spring or damper configuration changes the geometry. The propshaft angle should be inspected to confirm it remains within its working envelope, substantial rear-end changes occasionally produce propshaft angles outside the recommended range and require adjustment to restore proper drivetrain alignment.
The dedicated Suspension parent section covers the broader range of components needed for any rear-end conversion, and the technical team is available to advise on the appropriate combination for a specific application and intended use.